VulnerabilityPublished 10 Nov 2026

CVE-2026-124874: Same-origin Policy Bypass

Source GCVE Database

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Authoritative record:CVE-2026-124874· High

Not known to be exploited.

Data as of 10 Nov 2026, 18:03 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-7728-v6mf-ww67

What to do

AI-suggested

A fix for this vulnerability is available and has been incorporated in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7. Users and administrators should update to these versions or later to mitigate the risk. No additional mitigation steps are indicated by the vendor advisory.

Description

CVE-2026-124874 is a vulnerability in the Networking: HTTP component of Firefox that allows bypassing the same-origin policy. This security flaw was addressed and fixed in Firefox 160 and Firefox ESR versions 115.45 and 153.7. The vulnerability has a high impact rating according to the Mozilla advisory. No public exploit or active exploitation in the wild has been reported.

Impact

The impact is high as the vulnerability allows bypassing the same-origin policy, potentially enabling attackers to access or manipulate resources across different origins without proper authorization. This could lead to data leakage or unauthorized actions within the browser context.

Summary

This vulnerability involves a same-origin policy bypass in the Networking: HTTP component of Firefox. The same-origin policy is a critical security mechanism that restricts how documents or scripts loaded from one origin can interact with resources from another origin. Bypassing this policy can lead to unauthorized access to sensitive information or cross-origin attacks. Mozilla fixed this issue in Firefox 160 and Firefox ESR 115.45 and 153.7. The advisory classifies the impact as high, indicating significant security implications if exploited.

References

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